import com.mysql.cj.jdbc.Driver;

import java.sql.*;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        //查询
        //m1();
        //条件查询
        //m2();
        //增加
        //m3();
        //删除
        //m4();
        //修改
        m5();
    }

    private static void m1() {
        //1.加载驱动
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.获取连接(url,username,passward)
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            Connection connection=DriverManager.getConnection(url,"root","050206yrx");
//            if(connection!=null){
//                System.out.println("连接成功");
//            }
            //3.写sql
            String sql="select * from user";
            //4.预编译sql
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            //5.有参数设置参数

            //6.执行sql
            ResultSet resultSet = preparedStatement.executeQuery();
            //7.遍历
            while(resultSet.next()){
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id+"------"+name+"-------"+pass+"------");
            }
            //8.关闭资源
            resultSet.close();
            preparedStatement.close();
            connection.close();

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
    private static void m2() {
        try {
            //Scanner
            //1.加载驱动
            Scanner sc=new Scanner(System.in);
            System.out.println("请输入你要查询的姓名");
            String word = sc.next();
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.获取连接(url,username,passward)
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            Connection connection=DriverManager.getConnection(url,"root","050206yrx");
//            if(connection!=null){
//                System.out.println("连接成功");
//            }
            //3.写sql
            String sql="select * from user where name like ? ";
            //4.预编译sql
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            //5.有参数设置参数
            preparedStatement.setObject(1,"%"+word+"%");
            //6.执行sql
            ResultSet resultSet = preparedStatement.executeQuery();
            //7.遍历
            while(resultSet.next()){
                int id = resultSet.getInt(1);
                String name = resultSet.getString(2);
                String pass = resultSet.getString(3);
                System.out.println(id+"------"+name+"-------"+pass+"------");
            }
            //8.关闭资源
            resultSet.close();
            preparedStatement.close();
            connection.close();

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
    private static void m3() {

        try {
            //1.加载驱动
            Scanner sc=new Scanner(System.in);
            System.out.println("请输入姓名");
            String name = sc.next();
            System.out.println("请输入密码");
            int pass = sc.nextInt();
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.获取连接(url,username,passward)
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            Connection connection=DriverManager.getConnection(url,"root","050206yrx");
//            if(connection!=null){
//                System.out.println("连接成功");
//            }
            //3.写sql
            String sql="insert into user(name,pass) values (?,?)";
            //4.预编译sql
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            //5.有参数设置参数
            preparedStatement.setObject(1,name);
            preparedStatement.setObject(2,pass);

            //6.执行sql
            int result = preparedStatement.executeUpdate();
            //7.结果判断
            if(result>0){
                System.out.println("新增成功");
            }
            //8.关闭资源
            //resultSet.close();
            preparedStatement.close();
            connection.close();

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
    private static void m4() {
        try {
            //1.加载驱动
            Scanner sc=new Scanner(System.in);
            System.out.println("请输入id");
            int id = sc.nextInt();
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.获取连接(url,username,passward)
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            Connection connection=DriverManager.getConnection(url,"root","050206yrx");
//            if(connection!=null){
//                System.out.println("连接成功");
//            }
            //3.写sql
            String sql="delete from user where id=?";
            //4.预编译sql
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            //5.有参数设置参数
            preparedStatement.setObject(1,id);
            //6.执行sql
            int result = preparedStatement.executeUpdate();
            //7.遍历
            if(result>0){
                System.out.println("删除成功");
            }
            //8.关闭资源
            //resultSet.close();
            preparedStatement.close();
            connection.close();

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
    private static void m5(){
        try {
            //1.加载驱动
            Scanner sc=new Scanner(System.in);
            System.out.println("请输入姓名");
            String name = sc.next();
            System.out.println("请输入新密码");
            int pass = sc.nextInt();
            Class.forName("com.mysql.cj.jdbc.Driver");

            //2.获取连接(url,username,passward)
            String url="jdbc:mysql://127.0.0.1:3306/jdbc?characterEncoding=utf-8";
            Connection connection=DriverManager.getConnection(url,"root","050206yrx");
//            if(connection!=null){
//                System.out.println("连接成功");
//            }
            //3.写sql
            String sql="update user set pass = ? where name = ?";
            //4.预编译sql
            PreparedStatement preparedStatement = connection.prepareStatement(sql);
            //5.有参数设置参数
            preparedStatement.setObject(1,pass);
            preparedStatement.setObject(2,name);
            //6.执行sql
            int result = preparedStatement.executeUpdate();
            //7.遍历
            if(result>0){
                System.out.println("修改成功");
            }
            //8.关闭资源
            //resultSet.close();
            preparedStatement.close();
            connection.close();

        } catch (ClassNotFoundException e) {
            throw new RuntimeException(e);
        }catch (SQLException e){
            throw new RuntimeException(e);
        }
    }
}